中文幕亚洲精品乱码色偷偷亚_国产午夜性爽视频男人的天堂_欧美高潮流白浆喷水在线观看_亚洲夜色久一久二亚洲琪琪卡一卡二_暖暖亚洲一区二区三区AV无码

400 mln-year-old marine animal fossil found in SW China

Source: Xinhua| 2018-05-20 16:53:15|Editor: ZX
Video PlayerClose

GUIYANG, May 20 (Xinhua) -- Scientists from the Chinese Academy of Sciences have recently found a fossilized body piece of an extinct class of marine animal known as Cystoidea or cystoids in southwest China's Guizhou Province.

The fossil, that dates back some 400 million years, was discovered in Tongzi County while the scientists were studying a geological section in the area, according to the county government.

With an egg-shaped body, cystoids are echinoderms, marine invertebrates that existed during the Pleozoic Era, the Ordovician and Silurian Periods, and became extinct during the Devonian Period.

Guizhou boasts a rich store of prehistoric treasures. Fossils of various extinct invertebrate marine species have been discovered in the area. Tens of thousand of vertebrate fossils have also been found there.

TOP STORIES
EDITOR’S CHOICE
MOST VIEWED
EXPLORE XINHUANET
010020070750000000000000011100001371930961